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Repeat Prob.11-61 assuming isentropic efficiencies of 75 percent for the compressor and 80 percent for the turbine.
Prob. 11-61
A gas refrigeration system using air as the working fluid has a pressure ratio of 4. Air enters the compressor at -7°C. The high-pressure air is cooled to 27°C by rejecting heat to the surroundings. It is further cooled to -15°C by regenerative cooling before it enters the turbine. Assuming both the turbine and the compressor to be isentropic and using constant specific heats at room temperature, determine
(a) the lowest temperature that can be obtained by this cycle,
(b) the coefficient of performance of the cycle, and
(c) the mass flow rate of air for a refrigeration rate of 12 kW.
Determine the specific surfaces in m2/g units for the spheres of diameters (a) 10.0 cm, (b) 1.0 cm,(c) 0.1 cm, (d) 0.01 cm. (e) 0.001 cm and (f) 0.0001 cm. Assume the mass density of spheres as 2.5g/cc.
A cantilevered W12X136 (ASTM-A36) steel member beam is 18 feet in length. if a concentrated load of 12 kips is applied at a point 6.25 feet from the beam's free end, use the superposition technique to find
Knowing that these forces are equivalent to a force-couple system at C consisting of the force C= (- 8 N)i+ (4 N)k and the couple Mc =(360 N ⋅ m)i, determine the forces applied at A and B when Az = 2 N.
Design a 4-bitregister with two control inputs S1 and S0, four data inputs I3,I2,I1, I0, and four dataoutputs Q3, Q2, Q1, Q0. S1S0=00 means maintain the present value, S1S0=01means
A city near the epicenter of an earthquake sustains major damage to poorly constructed building, althought hospital and schools designed to resist dmage from ground motion sustsain only minor damage.
A 1.0-m rigid horizontal support is hung by two cables. One cable is brass and The other cable is high-density polyethylene plastic. At room temperature (21°C), the cables measure 3.50 m vertically.
Two vertical, parallel, clean, glass plates are spaced a distance of 2.3 mm apart. If the plates are placed in water how high will the water rise between the plates (in mm) due to capillary action? Use a value of 0.073 N/m for the surface tension for..
A water contains a suspended solids concentration of 10.30 mg/L. Coagulation reduces this to 1.0 mg/L. To accomplish this, an alum dose of 13.30 mg/L is necessary. What is the dry weight of sludge produced in kg/day if the plant treats water at a rat..
An engineering mistake has resulted in the need to connect an already constructed tunnel and bridge with a vertical curve. The profile of the bridge and tunnel is given in the figure below
Write a script newquot.m that uses the Newton quotient, [f (x + h) - f (x)]/h, to estimate the first derivative of f (x) = x3 at x = 1, using successively smaller values of h: 1, 10-1, 10-2, and so forth. Use a function M-file for f (x).
Terry wants to purchase a used car for $8000. The dealer offered to finance the deal at 8.5% APR for 4 years with 10% down payment. Terry's bank will provide a loan at 7.8% for 3 years,
a 9in radius cylinder of weight 18lb rests on a 6lb carriage. the system is at rest when a force p of magnitude 2.5 lb is applied ( p is coming out of the car the cylinder is sitting on and going to the right) for 1.2s.
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